135 
(<). Var. intermedium, Eaton. Aspidium Americanum, Davenport 
(Am. Nat.). 
This is the most common form, and seems quite distinct from either 
of the above varieties. Frequent in moist woods. Other varieties 
may be found corresponding very well with the numerous named 
forms, in which English fern books abound, most of which are not 
constant and are unworthy of a separate name. 
Aspidium Boottii, Tuckerman. A. spinulosum, Sw., var. Boottii 
(Gray’s Manual). 
Swamps. Frequent. A very distinct species. 
Aspidium cristatum, Sw. 
Situations similar to the last. Frequent. 
Var. Clintonianum, LZaion. 
Wenham swamp (J. H. S. and J. R.). Scarce. 
Aspidium marginale, Sw. 
Rocky places in the shade. Common. 
Aspidium acrostichoides, Sw. (CHRISTMAS FERN.) 
Rocky woods. Common. 
Var. incisum (Gray’s Manual). 
West Newbury (W. P. Conant), Georgetown, Beverly. Occasional. 
Cystopteris fragilis, Bernh. 
Damp rocks. Common. Often disappearing by the latter part of 
August. 
Onoclea Struthiopteris, L L. Struthiopteris Germanica, Willd. 
(Gray’s Manual.) (OsTRICH FERN.) 
North Andover, near Sutton’s Mills station and the Merrimac river 
(abundant), Georgetown, Boxford. Scarce. 
Onoclea sensibilis, Z. (SENSITIVE FERN.) 
Moist places. Very common. 
Var. obtusilobata (Gray’s Manual, etc.). 
Frequently met with. This is merely a fertile frond which is partly 
sterile and is common to all species, having contracted fruiting 
fronds or portions of fronds, as in O. Struthiopteris, Osmunda 
(var. frondosa), Lygodium, and in Botrychium (Ophioglossacee). 
It is an abnormal condition and not a true variety. 
Woodsia obtusa, Torr. 
Rocky places in half shade.. Rather scarce. 
Woodsia Ilvensis, R. Br. 
Rocky hills, in exposed situations; particularly abundant in the 
vicinity of Salem. 
Dicksonia pilosiuscula, Willd. D. punctilobula, Kunze (Gray’s 
Manual, 5th ed.). (Hay-scENTED FERN.) 
Shady places in moist woods. Common. 
